Try turning the light switch (or the breaker) off and immediatly turn it back on. There is an override built into the switch to allow you to override the photocell and turn the light on during the day if needed. It sounds like the override may be on.

To turn the override on you just interrupt power for a second, and to turn it off do the same or switch the light off. Turn it back on later in the day.

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Place tape over photocell lens, and flash switch off-on. Did the light come on?If you know how - remove the photocell from the circuit and see if the light works. If the light works, then the photocell is probably bad. Check power from switch to photocell with test meter.

Yeah, I have seen tons of these units fail early. Usually someone stripped the gears.
Another approach, in terms of lighting control, is use dusk to dawn or timed motion sensors. They are always "on time" where the clock needs to be changed many times over the course of season changes, etc.
They do not need to be reset after power failure or daylight savings, they just always work/
In a commercial building, interior lights should be on 24/7 OR motion sensors, and external lights Dusk to dawn.
In residential, motion with duration timer systems seem to work the best. Replace the Intermatic. Even the digital Intermatic requires user intervention all the time.

The power wire coming into the control has a black, white and copper (ground) wire. Hook the balck wire to the control black, All the gound wires hook together, all the white wires hook together, then hook the red wire to the black of the light that you want to turn off and on.

It may be your location for the photo cell. There is a cover on the cell in most cases that slides up and down to let in light. Or you may try turning it in a little different direction to get more light.

The output setting if turned off isn't adjusting the temperature in the room automatically if its off,and by turning the output up is like turning up the heat.By turning the output switch on you can let the heater automatically control the heat.Still you need to monitor the adjustments to your liking and then you know how hot it will be when you come back into that room.